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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: CastExprParser.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.expr;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.regex.Matcher;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.dellroad.stuff.java.Primitive;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.dellroad.stuff.java.PrimitiveSwitch;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.parse.ParseContext;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.parse.ParseSession;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.parse.Parser;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.parse.SpaceParser;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>/**<a name="line.19"></a>
<span class="sourceLineNo">020</span> * Parses type cast expressions.<a name="line.20"></a>
<span class="sourceLineNo">021</span> */<a name="line.21"></a>
<span class="sourceLineNo">022</span>public class CastExprParser implements Parser&lt;Node&gt; {<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>    public static final CastExprParser INSTANCE = new CastExprParser();<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    private final SpaceParser spaceParser = new SpaceParser();<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    @Override<a name="line.28"></a>
<span class="sourceLineNo">029</span>    public Node parse(ParseSession session, ParseContext ctx, boolean complete) {<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>        // Try cast<a name="line.31"></a>
<span class="sourceLineNo">032</span>        final int start = ctx.getIndex();<a name="line.32"></a>
<span class="sourceLineNo">033</span>        final Matcher castMatcher = ctx.tryPattern("\\((" + IdentNode.NAME_PATTERN<a name="line.33"></a>
<span class="sourceLineNo">034</span>          + "(\\s*\\.\\s*" + IdentNode.NAME_PATTERN + ")*)\\s*\\)\\s*");<a name="line.34"></a>
<span class="sourceLineNo">035</span>        if (castMatcher != null) {<a name="line.35"></a>
<span class="sourceLineNo">036</span>            final String className = castMatcher.group(1).replaceAll("\\s", "");<a name="line.36"></a>
<span class="sourceLineNo">037</span>            if (className.equals("null")) {<a name="line.37"></a>
<span class="sourceLineNo">038</span>                ctx.setIndex(start);<a name="line.38"></a>
<span class="sourceLineNo">039</span>                return UnaryExprParser.INSTANCE.parse(session, ctx, complete);<a name="line.39"></a>
<span class="sourceLineNo">040</span>            }<a name="line.40"></a>
<span class="sourceLineNo">041</span>            final Node target = this.parse(session, ctx, complete);             // associates right-to-left<a name="line.41"></a>
<span class="sourceLineNo">042</span>            ctx.skipWhitespace();<a name="line.42"></a>
<span class="sourceLineNo">043</span>            return new Node() {<a name="line.43"></a>
<span class="sourceLineNo">044</span>                @Override<a name="line.44"></a>
<span class="sourceLineNo">045</span>                public Value evaluate(final ParseSession session) {<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>                    // Evaluate target<a name="line.47"></a>
<span class="sourceLineNo">048</span>                    final Object obj = target.evaluate(session).get(session);<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>                    // Handle primitive cast, e.g. "(int)foo"<a name="line.50"></a>
<span class="sourceLineNo">051</span>                    final Primitive&lt;?&gt; primitive = Primitive.forName(className);<a name="line.51"></a>
<span class="sourceLineNo">052</span>                    if (primitive != null &amp;&amp; primitive != Primitive.VOID) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>                        if (obj == null)<a name="line.53"></a>
<span class="sourceLineNo">054</span>                            throw new EvalException("invalid cast of null value to " + className);<a name="line.54"></a>
<span class="sourceLineNo">055</span>                        if (primitive == Primitive.BOOLEAN)<a name="line.55"></a>
<span class="sourceLineNo">056</span>                            return new ConstValue(new ConstValue(obj).checkBoolean(session, "cast to " + className));<a name="line.56"></a>
<span class="sourceLineNo">057</span>                        final Number num = obj instanceof Character ?<a name="line.57"></a>
<span class="sourceLineNo">058</span>                          (int)(Character)obj : new ConstValue(obj).checkNumeric(session, "cast to " + className);<a name="line.58"></a>
<span class="sourceLineNo">059</span>                        return new ConstValue(primitive.visit(new PrimitiveSwitch&lt;Object&gt;() {<a name="line.59"></a>
<span class="sourceLineNo">060</span>                            @Override<a name="line.60"></a>
<span class="sourceLineNo">061</span>                            public Object caseVoid() {<a name="line.61"></a>
<span class="sourceLineNo">062</span>                                throw new RuntimeException("internal error");<a name="line.62"></a>
<span class="sourceLineNo">063</span>                            }<a name="line.63"></a>
<span class="sourceLineNo">064</span>                            @Override<a name="line.64"></a>
<span class="sourceLineNo">065</span>                            public Object caseBoolean() {<a name="line.65"></a>
<span class="sourceLineNo">066</span>                                throw new RuntimeException("internal error");<a name="line.66"></a>
<span class="sourceLineNo">067</span>                            }<a name="line.67"></a>
<span class="sourceLineNo">068</span>                            @Override<a name="line.68"></a>
<span class="sourceLineNo">069</span>                            public Object caseCharacter() {<a name="line.69"></a>
<span class="sourceLineNo">070</span>                                throw new RuntimeException("internal error");<a name="line.70"></a>
<span class="sourceLineNo">071</span>                            }<a name="line.71"></a>
<span class="sourceLineNo">072</span>                            @Override<a name="line.72"></a>
<span class="sourceLineNo">073</span>                            public Object caseByte() {<a name="line.73"></a>
<span class="sourceLineNo">074</span>                                return num.byteValue();<a name="line.74"></a>
<span class="sourceLineNo">075</span>                            }<a name="line.75"></a>
<span class="sourceLineNo">076</span>                            @Override<a name="line.76"></a>
<span class="sourceLineNo">077</span>                            public Object caseShort() {<a name="line.77"></a>
<span class="sourceLineNo">078</span>                                return num.shortValue();<a name="line.78"></a>
<span class="sourceLineNo">079</span>                            }<a name="line.79"></a>
<span class="sourceLineNo">080</span>                            @Override<a name="line.80"></a>
<span class="sourceLineNo">081</span>                            public Object caseInteger() {<a name="line.81"></a>
<span class="sourceLineNo">082</span>                                return num.intValue();<a name="line.82"></a>
<span class="sourceLineNo">083</span>                            }<a name="line.83"></a>
<span class="sourceLineNo">084</span>                            @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>                            public Object caseFloat() {<a name="line.85"></a>
<span class="sourceLineNo">086</span>                                return num.floatValue();<a name="line.86"></a>
<span class="sourceLineNo">087</span>                            }<a name="line.87"></a>
<span class="sourceLineNo">088</span>                            @Override<a name="line.88"></a>
<span class="sourceLineNo">089</span>                            public Object caseLong() {<a name="line.89"></a>
<span class="sourceLineNo">090</span>                                return num.longValue();<a name="line.90"></a>
<span class="sourceLineNo">091</span>                            }<a name="line.91"></a>
<span class="sourceLineNo">092</span>                            @Override<a name="line.92"></a>
<span class="sourceLineNo">093</span>                            public Object caseDouble() {<a name="line.93"></a>
<span class="sourceLineNo">094</span>                                return num.doubleValue();<a name="line.94"></a>
<span class="sourceLineNo">095</span>                            }<a name="line.95"></a>
<span class="sourceLineNo">096</span>                        }));<a name="line.96"></a>
<span class="sourceLineNo">097</span>                    }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>                    // Handle regular cast<a name="line.99"></a>
<span class="sourceLineNo">100</span>                    final Class&lt;?&gt; cl = session.resolveClass(className);<a name="line.100"></a>
<span class="sourceLineNo">101</span>                    if (cl == null)<a name="line.101"></a>
<span class="sourceLineNo">102</span>                        throw new EvalException("unknown class `" + className + "'");     // TODO: tab-completions<a name="line.102"></a>
<span class="sourceLineNo">103</span>                    if (obj != null &amp;&amp; !cl.isInstance(obj))<a name="line.103"></a>
<span class="sourceLineNo">104</span>                        throw new EvalException("can't cast object of type " + obj.getClass().getName() + " to " + className);<a name="line.104"></a>
<span class="sourceLineNo">105</span>                    return new ConstValue(obj);<a name="line.105"></a>
<span class="sourceLineNo">106</span>                }<a name="line.106"></a>
<span class="sourceLineNo">107</span>            };<a name="line.107"></a>
<span class="sourceLineNo">108</span>        }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>        // Parse unary<a name="line.110"></a>
<span class="sourceLineNo">111</span>        return UnaryExprParser.INSTANCE.parse(session, ctx, complete);<a name="line.111"></a>
<span class="sourceLineNo">112</span>    }<a name="line.112"></a>
<span class="sourceLineNo">113</span>}<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>




























































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